<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
    <input type="text" v-focus />
  </div>

  <script src="./vue.js"></script>
  <script>
    new Vue({
      el: '#app',
      data: {},
      methods: {},
      directives: {
        focus: {
          bind(el, obj) {  // css操作
            el.style.color = 'green'
          },
          inserted(el, obj) {  // js操作
            el.focus()
          }
        },
        test: {

        },
        hah:{
          
        }
      }
    })
  </script>
</body>
</html>